As a present for a friend I just recently picked up an Eiger. Specifically a neutral XPG, single AAA keychain tube, brass one.
Since it was a present I didn't use it much and get enough pictures to pose a decent review. I was very impressed though for a simple twist-on light. The QTC gave it a bit of flicker while ramping up and down at certain points but the threads were clean and it was bright as heck. It really made me wonder why I would choose anything else for an AAA light. These lights are more "EDC" than anything and while the Eiger isn't the smallest kid on the block the options you can select are pretty awesome.
* Cool White, Neutral, High CRI
* Normal head, Ultra (wider and 3 times the throw), or Ultra X (Li-Ion only)
* Wide or narrow optic
* Aluminum, SS, or Brass (or mix n match)
* Keychain body, Lug (removable end for momentary switch or keychain), or Pocket (shortest and flat end).
Since it accepts like .8-4.2v you can run a single alkaline or a 10440 Li-ion cell. That means you can ramp up from a fraction of a lumen to at least 200 lumens OTF. There aren't any modes as the QTC pill allows nigh-infinite brightness with a quick or slow turn. The Eiger Ultra X is even more output being designed solely for Li-Ion (or Li-Mn) power.
I'm not a "Made in America" zealot but it is pretty cool. They range from about $49-70 so it's certainly not a threat for the 4Sevens Preon1 market.
For you folks that hate modes and don't mind twisting the head it might be worth checking out. The momentary switch is somewhat stiff but works in a pinch ramping in the same way (squeeze low to high brightness).
Oh, and did I mention you can get it in Brass?
PS: The worst thing by far is the packaging. Oh well.